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Summary
| Description |
English: Layered gabbros of the troctolitic series in the Duluth Complex at a roadcut next to parking lot for the Thomson Hill Information Center, Skyline Parkway, northern side of Interstate 35, just west of the Route 2-Interstate 35 intersection, west of Duluth, Minnesota, USA. (Geology hammer for scale). The gabbro formed 1099 million years ago. This is gabbro, a mafic, phaneritic, intrusive igneous rock composed principally of plagioclase feldspar and pyroxene. This rock is part of the widespread Duluth Complex, a ~1.1 billion year old suite of igneous rocks in northeastern Minnesota that is associated with volcanism in the Lake Superior segment of the ancient Mid-Continent Rift System. Layering is not commonly seen in intrusive igneous rocks. These layered gabbros are the result of repeated episodes of crystal settling in a magma chamber. |
| Date | |
| Source | https://www.flickr.com/photos/jsjgeology/21454438859/ |
| Author | James St. John (https://www.flickr.com/people/jsjgeology/) |
| Camera location |  | View this and other nearby images on: OpenStreetMap |  |
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Licensing
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/21454438859 (archive). It was reviewed on 25 May 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:23, 25 May 2018 | | 4,000 × 3,000 (5.8 MB) | FlickreviewR 2 | Replacing image by its original image from Flickr |
| 19:22, 25 May 2018 |  | 1,024 × 768 (442 KB) | GeoWriter | User created page with UploadWizard |
File usage
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